I mean successful feeds with you. I'm sure she was eating prior to when you got her. Her "prey" should be about the same width as the largest area of her body. So, as long as pinks are still the same size as her body, don't bump her up yet.
Snakes really aren't social, and shouldn't be housed together, so when she was at the pet store, she was probably just upset that she was with others (at least that's my guess). They are crepuscular, active most during dawn and dusk, but if I get up in the middle of the night to get a drink or something she's sometimes out. So, I suppose you could also make the argument that they are nocturnal. But I haven't heard any corn snake owners say that they are diurnal...and most people on snake forums seem to agree that crepuscular accurately describes them. Maybe you'll be lucky and yours will be out during the day some, but I've never encountered it.
You should definitely get into the habit of washing your hands before and after handling, it's good for you and the snake. But do you have to worry because you forgot this one time? Probably not. I know I've forgotten before, and probably will again, and I've even let my snakes nudge around my cheeks, and I haven't gotten anything yet. Try not to stress too much about it, because you can't do much about it now :)
2 dogs . 5 cats . 5 snakes . 5 bettas . 3 hamsters . 20gal community